Company lists · Data refreshed September 2026

Top 25 HR outsourcing advisors based in the United Kingdom

Name: HR outsourcing advisors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 3,646 companies tracked

RevenueBase identified 3,646 HR outsourcing advisors headquartered in the United Kingdom as of September 2026 and tracks 43,499 professional contacts across them, including 12,388 with verified work emails and 3,127 with mobile numbers. London is the largest hub.

This list covers HR outsourcing advisors headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

3,646Companies

43,499Contacts tracked

12,388Verified emails

3,127Mobile numbers

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The 25 largest HR outsourcing advisors based in the United Kingdom

Ranked by team size

Top 25 of 3,646 HR outsourcing advisors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to HR outsourcing advisors: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Robert Walters	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	4,423 contacts →
	Indirect evidence “Robert Walters is the world’s most trusted talent solutions business.” Source: RevenueBase Database · checked Sep 30, 2026
2	NGA Human Resources, An Alight Company	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	2,734 contacts →
	Partial evidence “At Alight \| NGA Human Resources our mission is to make HR work better.” Source: RevenueBase Database · checked Sep 30, 2026
3	Avance Consulting	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	1,927 contacts →
	Indirect evidence “Avance Consulting is a global organization focused on delivering innovative talent solution services to some of the most renowned companies in the world, across industries that…” Source: RevenueBase Database · checked Sep 30, 2026
4	Zellis	Indirect evidence	Bristol, United KingdomHQ checked Sep 30, 2026	1,001-5,000	1,465 contacts →
	Indirect evidence “Zellis helps organisations unlock better outcomes by creating exceptional experiences for their people.” Source: RevenueBase Database · checked Sep 30, 2026
5	ROC	Indirect evidence	Weybridge, United KingdomHQ checked Sep 30, 2026	501-1,000	532 contacts →
	Indirect evidence “We are a leading service provider of Human Capital Management (HCM) solutions across Europe, serving more than 1.5 million employees monthly with an annual revenue of 78 million…” Source: RevenueBase Database · checked Sep 30, 2026
6	Page Executive	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	5,001-10,000	450 contacts →
	Indirect evidence “Page Executive is a global leader in executive search & recruitment.” Source: RevenueBase Database · checked Sep 30, 2026
7	Aldelia	Partial evidence	Londres, United KingdomHQ checked Sep 30, 2026	1,001-5,000	410 contacts →
	Partial evidence “Aldelia is a world leading Human Resources advisory firm, leader in professional recruitment services.” Source: RevenueBase Database · checked Sep 30, 2026
8	Croner	Partial evidence	Wheatfield Way, United KingdomHQ checked Sep 30, 2026	201-500	400 contacts →
	Partial evidence “Our award winning HR and health & safety services free you from workforce admin and help keep you on the right side of the law.” Source: RevenueBase Database · checked Sep 30, 2026
9	Page Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	5,001-10,000	390 contacts →
	Partial evidence “Page Outsourcing was created to meet the business transformation needs of our clients.” Source: RevenueBase Database · checked Sep 30, 2026
10	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	333 contacts →
	Partial evidence “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Source: RevenueBase Database · checked Sep 30, 2026
11	GI Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	311 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 30, 2026
12	Huntress	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	289 contacts →
	Indirect evidence “Since our establishment in Huntress has been at the forefront of recruitment across a range of specialist sectors.” Source: RevenueBase Database · checked Sep 30, 2026
13	Rethink	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	225 contacts →
	Indirect evidence “Established in 2005 by Rethink Group, we deliver recruitment strategies for the curious: those who want to surpass their competition by attracting, engaging and hiring the best…” Source: RevenueBase Database · checked Sep 30, 2026
14	CIPHR	Partial evidence	Reading, United KingdomHQ checked Sep 30, 2026	201-500	219 contacts →
	Partial evidence “We provide HR, payroll, benefits and learning solutions for UK organisations with employees.” Source: RevenueBase Database · checked Sep 30, 2026
15	Adviserplus	Strong evidence	Ellesmere Port, United KingdomHQ checked Sep 30, 2026	201-500	205 contacts →
	Strong evidence “AdviserPlus is the UK’s leading provider of HR technology, consulting, and advisory services.” Source: RevenueBase Database · checked Sep 30, 2026
16	Tate Recruitment	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	203 contacts →
	Indirect evidence “Our Heritage Founded by Lady Virginia Tate in 1985, Tate Recruitment emerged with a firm vision: to be the best everywhere, all the time.” Source: RevenueBase Database · checked Sep 30, 2026
17	Join Talent	Indirect evidence	Brechin, United KingdomHQ checked Sep 30, 2026	201-500	200 contacts →
	Indirect evidence “Join Talent is a ‘talent acquisition as a service’ (TAaaS) business - dedicated to driving business scale up growth performance.” Source: RevenueBase Database · checked Sep 30, 2026
18	Omni RMS	Indirect evidence	Altrincham, United KingdomHQ checked Sep 30, 2026	51-200	190 contacts →
	Indirect evidence “Omni – Talent Is Everything At Omni, we help businesses find, attract, and retain the right people to drive long-term success.” Source: RevenueBase Database · checked Sep 30, 2026
19	The HR Dept	Partial evidence	Bristol, United KingdomHQ checked Sep 30, 2026	51-200	169 contacts →
	Partial evidence “Welcome to The HR Dept.” Source: RevenueBase Database · checked Sep 30, 2026
20	Consulting Point	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	168 contacts →
	Partial evidence “Consulting Point is a multi-award-winning talent strategy and advisory firm headquartered in the United Kingdom, with a truly global reach.” Source: RevenueBase Database · checked Sep 30, 2026
21	NEW Street Consulting Group Nscg	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	167 contacts →
	Partial evidence “We’re a leading people advisory consultancy that partners with you to source great executives, assess and develop leadership capabilities and expedite change and transformation.” Source: RevenueBase Database · checked Sep 30, 2026
22	Cintra HR & Payroll Services	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 30, 2026	51-200	148 contacts →
	Partial evidence “Proudly based in the North East, our multi award-winning Payroll & HR service has been delivering professional payroll and HR solutions for over 40 years.” Source: RevenueBase Database · checked Sep 30, 2026
23	Ixceed Solutions	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	137 contacts →
	Indirect evidence “iXceed Solutions is a global, end-to-end Talent Solutions, RPO, EOR, Enterprise Services, and Digital Transformation partner trusted by Fortune 100 and high-growth organizations…” Source: RevenueBase Database · checked Sep 30, 2026
24	The Barton Partnership B Corp	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	136 contacts →
	Indirect evidence “The Barton Partnership is a specialist strategic talent solutions provider, seamlessly bridging the gap between strategy and execution.” Source: RevenueBase Database · checked Sep 30, 2026
25	Veran Performance	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	134 contacts →
	Strong evidence “Winners of the UKOUG Business Transformation Advisory Partner of the Year Award 2025 Veran Performance is an advisory consultancy specialising in HR, Payroll, Procurement and…” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: HR outsourcing advisors. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names HR outsourcing advisors.
Partial evidence: Its own public description names part of HR outsourcing advisors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name HR outsourcing advisors. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 3,646 HR outsourcing advisors based in the United Kingdom

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HR outsourcing advisors based in the United Kingdom at a glance

As of Sep 30, 2026

28.5%Verified-email coverage

7.2%Mobile-number coverage

11.9Average contacts per company

1-10Median size (employees)

30.4%Largest-city concentration · London

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

2,868

11-50

568

51-200

134

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 32.0d

3,5850–30

8,25631–60

39861–90

890–180

141180+

Company record updated

Median 93.0d

00–30

4,84031–60

16,62461–90

18,88190–180

3,154180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among HR outsourcing advisors, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “HR outsourcing advisors”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names HR outsourcing advisors), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among HR outsourcing advisors, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 12,388 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

HR outsourcing advisors by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names HR outsourcing advisors, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many HR outsourcing advisors are there based in the United Kingdom?

RevenueBase identified 3,646 HR outsourcing advisors headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Robert Walters, headquartered in London, tops this list with the largest team on record.

Which city has the most HR outsourcing advisors?

London leads with 1109 headquartered companies, followed by Manchester (100) and Leeds (57).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 12,388 verified decision-maker contacts tracked across these 3,646 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.